Impboyed machete foe picking millstones



o @uiten lItalia getint fitte.

Inrnovnn lineman son Home MILLesferas.` f l J. n. GRAY, 0E BOSTON, MASSACHUSETT.S..

`Leners Patent No. 60,176, dated member 4, `1866;

sPEQF-CATION.

To ALL wHoM IT MAY CONCERN:` o t o o ,M Beit known that I, J. H. GRAY, of Boston, in the county of Suiollgand State oflilasosachusetts, have invented l, A l an Improved Dressing or Picking Machine for Millstones' and I do hereby doclarethatuthe followingQtake"1 l i connection withthe'drawings, which accompany and'form part of this specification, is a` description of my in tion suiieientto enable those skilled in the art to practise it. o r 1` o This machine is intended to be operated for the purpose of dressing or picking the operative surfac l millst'ones, (more especially those whieharensedfor the production of doux"fromwheatlwithfveryiiueli es, Ml successions or series of which are arranged parallelv to each other,` though such successionsl or" series arenoti, y i t 1a general thing, made parallel to all the other successions or series. y l "l if o It is well known to mllers and 'othersconvcrsant with the art of milling, that millstoues are madefwlth 13; grooves` or channels of `oonsixrlerable depth below the genenal dat operativelsurfaces of thegstones this ,3 y is not designed or intended. to cut or form said` grooves or channels, butto `makein the` general l ilat surf `of l l, thesto'nefand between the rsaid ehannelssuccessions, oroseries of lines or iinecuts, soulemillers makingm@ I` Vas thirty or 'lforty per inch.. The machine may also be used to3dress or pick with `fine,parallel cuts `inclined surface of said large channels or grooves, and also to dress the sharp corner or `anglefformed `by-Mtlic, surfaced of the stone and that side of each of the large channels or` grooves which is square or nearlygquarefhereiitm 1t has been proposed and attempted to` give the peculiar condition of surfacewhicli: `thisinaczhine,is designedto produce bys'uccessive scratches with adiemond, but in practiceitis found, thatftheresultsthus obtained re not suiciently enduring. i t Picking machines have also been invented, which have been organized `to3be,operated,automatically power, which has insolite cases'been applied through orfrom the millstone spindle. i The difficulty experienced; il 1 with machines worked by f powerl is that-all theblows ofthe tool `are given with `equal foree'upoii thesiirface of the stone, whichV is rarely homogeneous and of o equal hardness throughout; and, `sofar as I know, `the powerpicking machines have failed to give satisfaction, reason of the nnequal'depth lof thecuts or lines whichthey ,l make. At present the 'desired condition o'i millstone surfaces is generallyobtained ,in the o l'd way, that ,isiby the use of a handledntool worked by skillful millers who graduatetho force oftheilfblows `to the degree `ofpthe hardness of the stone. o j l A ,l i l A The object of my invention is first to produce a machine in ywhich .the blow shalLbe given bylthemiller` himself, sp as thereby to be by him tempered and.graduatedinforce accordingtothe degreeof hardnessfofthe` l stone in its various parte, and in which, at the same time, there isV provision by which,straightnessofeaeh l line is secured, and parallelism of a series of lines or cuts is obtained, together witha mechanical meansyfl determining the distance apart of the cuts, without moving the whole machined; and theliirs't partof inven-` tion consists in a millstone picking machine organized as just sta'tid. `In the year 1860 I made application ,for` l a patent for a machineembod'ying therein so' much of my, invention as hasjnst` been stated, but `in` said appli-V t cation claim was not then made to the substance of said statement, but was made to a certain arrangement land,` combination oi parts, which was, `upon examination, alleged tobe lacking in novelty.` `That: arrangement and@ 1 combination I have dispensed with. The object of my invention relates to, and consistsin, secondly, suchf ,l an organization and arrangement cfa millstone' picking` machineas shalll, allow ofits; disposition `upon the@ surface of a stone anywhere at the option oi'mthf,- miller without .reference to thefcentre or to the spindlef` of the mill, and so that any style'or theor'ypf dross 'of the surface of the stone may be `executed therebylunder, ,the control of the miller. Another part of my inverition consists` in addingl` tothe framework'of `my iiaeh'ine" 'aflangeso disposed and `arranged as to bear upon thesurfface of the millstoue, and serving for the miller to sit 3f upon WhileV operating thcpicking tool, thus securing by his weight, thema'chine fromymoving "from itsMadjost-t ment as to position on the stone. Other parts of' my invention consist in the details of `construction,and,arrange-` A ment of -the `members of my machine by which facility and accuracy of workingare obtained, and inothersby i which the cutter is readily removed, and is also properly securedin position. Of the `dr`awings t 3 Figurel shows my machine in plan in a reversed position; and i l t 1 Figure 2 siiows the same, right yside up, iu sectiontaken in the'linez z, fig. l, and i'n elevation beyond@ The frame of the machine is a'casting vmadea'itli concavities, as seen,`in which parts of thebperative i mechanism are located and workyand by which they'are protected, while the `shape given islwell adapted to `give l the requisite Strength and stiness tothe machine; and the bottom part of the frame is, made into a plane'ul-,

face, so as to bear evenly on the Surface of a millstone. In the two sides, a a, of the frame, are located two screws, b b, each having fixed thereon a chain orrag-wheel c, cach screw being made with bearing pointsv or pivots lat each end on which it rotates, one-pivot entering a step or bearing in the casting, and the other entering a step or bearing made in an adjusting screw, d, there being one such screw for each of the screws, b Z1, the sone-ws, d OZ, being provided with suitable' cheek nuts, e. On the screws, b, there are nnts,ff, in which is fixed the shaft, g, and on and over the rag-wheels passes the endless chain, h, the lower part running in the groove formed in the back bal', z', of the frame, while theiupper part passes-over said bar where it can be manipulated bythe operative; said chain passing through holes in the casting from one to the other side thereof. Oa the rear ot' the frame is made a wide, thin langehy', the lower side of' which is an extension of the plane of the lower side of the frame; this flange serves for the miller to sit upon while working the piclt, his weight securing the machine in any desired position. ',.lhc under side of this flange may be recessed, and faced with rubber or leather to aid in keeping the machine from slipping on the surace of the millstone. On the shaft, g, is fitted a long vhardened steel sleeve, s, made so as to slide closely but freely lengtliwise, 4upon the shaft. The outside oi' this sleeve is made slightly tapering, so that theforked jawtofthe pick helve,'7c, can be pressed so closely on the sleeve as to adhere thereto and move with it, this construction affording ready and convenient means for removing the pick, l, and its helve', It, from the shaft, g, when thepick requires to be sharpened, as the lower opening of the slot Ain the'helve is wide enough to permit ,the helve to pass over the sha-ft when the helve is removed from the sleeve. The piek 'is fastened by a sct-srew, m, in a piece, fn, which is journalled to the projecting end ol' the helve, so that the edge of the piek may be adjusted by turning, to be parallel with the axis oi' shaft g. The. piece, n, is held firmly by a screw and nut, o, at its upper end. The washer,p, is interposed between the nut a, and the helve c, and by varying the diameter of the washer 'the weight ol' the blow-giving parts may be changed as desired, while by placing the' washer, p, under'the helve, thepich carrier may be lowered to snit picks shortened by wear.A On the lower-side of the front bar, q, of the frame, and near one end thereof, is a piece, 1', having therein la slight groove made parallel with the axis of the shaft, g, and with the bottom surface ofthe machine, the purpose ot' said groove being to receive theledge ofthe pick, so as to set it truly parallel with the said .surface and axis. This machine is set by the lniller on the surface or the stone, and is adjusted Avthereon much after the manner in which adraughtsman adjusts` a parallel rule or triangle on a drawing-board; 'then the miller, sitting on the ilange,j, holds the machine from moving, while with one hand he seizes the helve of the pick and operates it with as much or as little force as the hardness ol' the stone calls for7 using his skill and judgment as lie-does with the old hand implement; but his work is'made easy and is accelerated, inasmuch as he does not have to guide thepielt, nor need he fear striking more with one corner their with the other,as the edge of`the piel: must fall fairly with its whole length on the surface of the stone. With the other hand, the millor moves the endless chain,iso as te draw the pick towards him or from him, as he chooses, after completing eaclrline. Practised ,inillers'need only the guidance of theeye in determining the distance apart of the lines, but a scale may be added on the upper part of the bar, t', under the chain, and pointers may be placed on the chain by which to indicate, to those who need such aid, the distance which the chain mu'st be moved to produce any given movementof the pick toward or away from the bar, g.

Other indicating devices-for the same purpose may be applied, but it is not necessary here to describe them; I claim a machine for the pnrposespecied, so arranged and organized that while the pick is guided and controlled as to the direction of its movement, each blow is effected and its force cont-rolled by the operative, substantially -as described. l l i i Also the arrangement and organization of a machine for picking millstones, complete and independent in itself, and fitted to be moved over and to operate anywhere upon the surface of such a stone, to produce linesin :any direction without attachment to the lnillstone centre or spindle, substantially as described.

Also the llange j, when combined with the matter forming the second claiming clause herein, and arranged as and for the purpose speciied. i i l Also the combination with a frame a ajz' q, of two `screws lfb, and means for simultaneensand equal rotation thereof, when said screws are provided with nuts fj', arranged to move a shai'tg, whichv bears a piel: helve.

Also the combination with the shaft g, of the eonicalisleeve s, thereon, aad the slotted hammer helve.

Also the combination with a millst-one picking machine et' a pick-set 1, or guideffor the purpose described.

Also the means described for securing the pick in position, and to the pick hclve. r l J. H. GRAY.

Witnesses:

J. B. CROSBY,

F. GoULD. 

